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08-23-2011, 11:20 PM
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#1
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Senior Member
Join Date: Nov 2006
Location: Mississippi
Posts: 120
SUN #108
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Changing Tire Questions
1. Uncouple trailer from tow vehicle?
2. If not uncoupled, unhook weight distribution bars?
3. What type of jack?
4. If using a short jack, what do you use to raise the jack?
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2006 T-3075 Toy Hauler
2006 Dodge Ram diesel 2500 4-door
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08-24-2011, 08:17 AM
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#2
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Senior Member
Join Date: May 2008
Location: Ontario
Posts: 663
SUN #597
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I use an 8 ton hydraulic. My trailer is low so a solid piece of lumber like at least 12" of 2x8 is good. I don't like to screw the extension out any further than necessary. For a higher trailer like yours double up on the 2x8. Always lift the frame, not the axle or spring seat and position close to the spring hanger--within 18" according to Sunline.
I don't think it matters much if your hitched or not, but anchor the trailer securely with chock blocks if unhitched. Definitely undo the wd bars or you'll be jacking the truck too.
Henry
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2019 F150 3.5L Max Tow
2014 Arctic Fox 22G
2005 Sunline T-2499
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08-24-2011, 12:21 PM
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#3
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Senior Member
Join Date: Apr 2007
Location: New York
Posts: 945
SUN #258
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I agree with Henry and add one comment. If the trailer is on an even slight grade, you may not be able to chock the wheels on the side your lifting. If both wheels come off the ground it will move. Best to leave it hooked up to the TV in this case so it can't move. Also best to remove the sway and load leveling bars to avoid undue stress or resistance.
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Paul & Sheri - Upstate New York - SUN-0258
Amateur Radio KD2KCY - VHF 146.520 MHz
2012 F150 F/X 4, 6cyl EcoBoost, Max Tow pkg
2013 Rockwood 8280WS 5th wheel
2006 Sunline Solaris T-1950
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08-24-2011, 06:47 PM
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#4
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Senior Member
Join Date: Apr 2007
Location: New York
Posts: 1,846
SUN #264
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Quote:
Originally Posted by 40_Acre_Mule
1. Uncouple trailer from tow vehicle?
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Like Paul, I prefer to leave the trailer hooked to the truck. Had to do it today on the side of the road as we had a flat on the TT for the first time in a long, long time.
Quote:
Originally Posted by 40_Acre_Mule
2. If not uncoupled, unhook weight distribution bars?
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I don't, but it's your choice. I can't see any technical reason for it.
Quote:
Originally Posted by 40_Acre_Mule
3. What type of jack?
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I prefer an 8 ton (or larger) bottle jack. They are extremely easy to use and small enough to carry about. The two ton ones are not particularly well built and don't have much lifting power.
Quote:
Originally Posted by 40_Acre_Mule
4. If using a short jack, what do you use to raise the jack?
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I carry lots of 4x4 cribbing pieces cut to about 11" long. I also have a good selection of 2x6 and 2x10 pieces, each about a foot long or so. Makes it easy to build up one side when leveling, to provide extra stabilization on sloped campsites, and when necessary, build up under a jack as needed.
If I am going to work under the trailer with one or more wheels off the ground, I use the cribbing and/or jack stands be sure the trailer can't fall on me. I usually crib right up to the frame.
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'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
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08-25-2011, 08:43 AM
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#5
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Senior Member
Join Date: Jan 2010
Location: Virginia
Posts: 638
SUN #987
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Can someone 'splain this to me?
Quote:
Originally Posted by henryj
Always lift the frame, not the axle or spring seat and position close to the spring hanger--within 18" according to Sunline.
Henry
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Given: The weight of the trailer is carried by the tires. The reverse path of "support" or "force" is tire-to-wheel bearings-to-stub axle (bolted to axle)-to-spring pad-to-springs-to-shackles-to-frame, right?
So if the spring pads on the axles are taking the load of the frame (through the springs) to the axle, why can't you position a jack at that point?
Inquiring minds want to know,
Teach
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Wright Ellis and Penny Sedgley
'10 Tundra 4X4
SOB -'14 Rockwood 2604WS ( Rocky)
"Life is a cruel teacher. She gives the test first; the lesson then follows."
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08-25-2011, 10:03 AM
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#6
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Senior Member
Join Date: Apr 2007
Location: New York
Posts: 1,846
SUN #264
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Quote:
Originally Posted by awellis3
Given: The weight of the trailer is carried by the tires. The reverse path of "support" or "force" is tire-to-wheel bearings-to-stub axle (bolted to axle)-to-spring pad-to-springs-to-shackles-to-frame, right?
So if the spring pads on the axles are taking the load of the frame (through the springs) to the axle, why can't you position a jack at that point?
Inquiring minds want to know,
Teach
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Good question, and one I don't think anyone really knows the real answer to.
I agree with your logic and have repeatedly jacked one wheel at the spring pad. Much shorter lift and a lot less effort overall.
I do know that Dexter cautions against jacking the axle tube as it could bend it.
Sunline had a drawing of the jack points in the manuals and it clearly specified jacking the frame either just forward or aft of of the spring shackle mounts.
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'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
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08-25-2011, 01:32 PM
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#7
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Senior Member
Join Date: Jan 2010
Location: Virginia
Posts: 638
SUN #987
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Regarding Dexter's warning: I always thought that was the legal dept., not the engineers, speaking. I can see bending an axle if one were to go "jack happy" and try to lift the axle too high. But lifting it just enough to mount a new tire couldn't cause any damage to the axle. We're only talking about an extra inch or two. And if that could cause damage, what about those ramps where you drive one wheel up on the platform and leave the other tandem wheel hanging. To me, that's mo' dangerous to the suspension than a 2" lift at the spring pad.
I've jacked my pop up's single axle by the pad with no ill effects and suspect, when the time comes, I will jack my Sunny's axle in the same manner.
Teach
__________________
Wright Ellis and Penny Sedgley
'10 Tundra 4X4
SOB -'14 Rockwood 2604WS ( Rocky)
"Life is a cruel teacher. She gives the test first; the lesson then follows."
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08-25-2011, 01:52 PM
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#8
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Senior Member
Join Date: May 2008
Location: Ontario
Posts: 663
SUN #597
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I'm only repeating what I've seen elsewhere. Lifting the frame in front of the leading tire does lift both tires off the ground on the 2499. Does that happen on the spring pads too? Mostly I'm working on brakes or bearings so lifting both is an advantage. On a single axle the spring is firmly anchored at both ends, but the middle ends on a tandem axle are "loose" at the equalizer. What does the equalizer do when you lift at the spring pad?
Henry
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2019 F150 3.5L Max Tow
2014 Arctic Fox 22G
2005 Sunline T-2499
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08-25-2011, 06:05 PM
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#9
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Senior Member
Join Date: Apr 2011
Location: Maine
Posts: 3,357
SUN #2097
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I would not jack it up in the center of the axle tube you do run a risk of bending the axle that way. Directly under the spring pad or on the axle close to the spring pad should be fine. When I service the bearings etc. I jack mine up by the tank protector loops they are very strong.
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08-26-2011, 08:48 AM
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#10
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Senior Member
Join Date: Jan 2010
Location: Virginia
Posts: 638
SUN #987
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Quote:
Originally Posted by henryj
I'm only repeating what I've seen elsewhere. Lifting the frame in front of the leading tire does lift both tires off the ground on the 2499. Does that happen on the spring pads too? Mostly I'm working on brakes or bearings so lifting both is an advantage. On a single axle the spring is firmly anchored at both ends, but the middle ends on a tandem axle are "loose" at the equalizer. What does the equalizer do when you lift at the spring pad?
Henry
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I'm with you. If I were servicing brakes and bearings, I'd jack the frame in two places (fore and aft) and use jackstands. There you are in a controlled environment with all necessary tools.
Broken down on the side of the road, I'll opt for quick and easy - lift the pad of the affected wheel, change it out, and beat boogie.
I haven't jacked a tandem axle (knock on wood), but I'd assume only the jacked axle would clear the ground. Anybody with experience?
Teach
__________________
Wright Ellis and Penny Sedgley
'10 Tundra 4X4
SOB -'14 Rockwood 2604WS ( Rocky)
"Life is a cruel teacher. She gives the test first; the lesson then follows."
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08-26-2011, 06:37 PM
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#11
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Senior Member
Join Date: Apr 2007
Location: New York
Posts: 1,846
SUN #264
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Quote:
Originally Posted by awellis3
I haven't jacked a tandem axle (knock on wood), but I'd assume only the jacked axle would clear the ground. Anybody with experience?
Teach
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You are correct. When I do a tire, I get the jack right under the spring pad and axle. Only have to lift it an inch or two for the tire to clear. A few turns of the impact wrench and I am done.
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'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
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